| Boyle, Robert New experiments physico-mechanicall, touching the spring of the air and its effects 1660 |
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fill up all the crannies, or other little ca
vities, at which the Air might otherwise
get entrance.
All things being thus fitted, and the
lower shank (O) of the stop-cock being
put into the upper Orifice of the Cylin
der (&), into which it was exactly ground;
the Experimenter is first, by turning the
handle, to force the Sucker to the top of
the Cylinder, that there may be no Air
left in the upper part of it: Then shut
ting the Valve with the Plug, and turning
the other way, he is to draw down the
Sucker to the bottom of the Cylinder;
by which motion of the Sucker, the Air
that was formerly in the Cylinder being
thrust out, and none being permitted to
succeed in its room, 'tis manifest that the
cavity of the Cylinder must be empty,
in reference to the Air: So that if there
upon the Key of the Stop-cock be so
turn'd, as that through the perforation of
it, a free passage be opened betwixt the
Cylinder and the Receiver, part of the
Air formerly contain'd in the Receiver,
will nimbly descend into the Cylinder.
And this Air, being by the turning back
of the Key hinder'd from the returning
into the Receiver, may, by the opening
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